!636

!1000363 // class _x16

main {

  static Method findMainMethod(Class<?> theClass) {

    for (Method method : theClass.getMethods())

      if (method.getName().equals("main") && method.getParameterTypes().length == 1)

        return method;

    throw new RuntimeException("Method 'main' with 1 parameter not found in " + theClass.getName());

  }

  psvm {

    String mainSrc = "return (String) o + \" \" + (String) o;";

    String prelude = "public class main { public static Object main(Object o) throws Exception {\n";

    String postlude = "\n}}";

    String src = prelude + mainSrc + postlude;

    File srcDir = _x16.TempDirMaker_make();

    File classesDir = _x16.TempDirMaker_make();

    _x16.saveTextFile(new File(srcDir, "main.java").getPath(), src);

    List<File> libraries = new ArrayList<File>();

    String javacOutput = _x16.compileJava(srcDir, libraries, classesDir);

    System.out.println(javacOutput);

    URL[] urls = {classesDir.toURI().toURL()};

    // make class loader

    URLClassLoader classLoader = new URLClassLoader(urls);

    // load main class

    Class<?> mainClass = classLoader.loadClass("main");

    Method m = findMainMethod(mainClass);

    Object in = "helloinput";

    Object out = m.invoke(null, in);

    System.out.println(in + " => " + out);

  }

}